For this study the investigators will record EEGs on computerized monitors. These recording machines are small portable computers (about the size of a "Walk-Man") which the patient wears for one hour. The brain-wave sensing electrodes are attached to the patients' scalp with a water-soluble temporary conducting glue. These monitors are placed on the patients in the EEG laboratory at New York Hospital-Cornell. The recorded EEG signal is downloaded to our EEG analysis computer. This is a routine test commonly performed to evaluate patients with epilepsy, and the ambulatory EEG in and of itself is not experimental in any way.